What is one of the two recognized quality control programs in precast concrete manufacturing?

The American Society for Testing and Materials (ASTM) standards are widely recognized quality control programs in precast concrete manufacturing. These standards provide comprehensive guidelines and specifications that help ensure the quality and reliability of construction materials, including precast concrete elements.

ASTM standards cover a wide range of tests and specifications, including those for the materials used in concrete, the necessary strength and durability characteristics, and the methods for evaluating and testing these materials. By adhering to ASTM standards, manufacturers can ensure that their products meet both industry standards and the requirements of regulatory bodies. This alignment is crucial for delivering safe and durable concrete structures, and hence makes it a significant quality control program in the field.

The other options may offer guidance or practices related to concrete, but they do not hold the same level of recognition or standardization as the ASTM, which is integral to the quality assurance processes in precast concrete manufacturing.